Auxiliary sound reproducing apparatus



Feb. 7, 1939. H A ADAMS 2,145,963

AUXILIARY SOUND REPRODUCING APPARATUS Filed May 8, 1937 [NVENTOR ATTORNEY Patented Feb. 7, 1939 UNITED STATES PATENT OFFICE AUXILIARY SOUND REPRODUCING APPARATUS 2 Claims.

This invention relates to auxiliary sound reproducing apparatus for use in combination with a loud speaker.

One object of my invention is to provide auxil- 5 iary apparatus that will materially aid to more perfectly reproduce the original sound or tone of music, a voice or other vocal expression coming over the radio or from a phonograph or the like, and at the same time make it possible to increase the volume without a corresponding increase in boom or roar. Another object is to so construct said apparatus that a layman can install and use it in such a manner that it multiplies and beautifies tone, whether emanating from a human voive or through a radio, phonograph or other source of sound.

The foregoing and other objects which will appear as the nature of the invention is better understood, may be accomplished by a construction, combination and arrangement of parts such as is disclosed by the drawing and specification. The nature of the invention is such as to render it susceptible to various changes and modifications, and, therefore, I am not to be limited to said disclosure; but am entitled to all such changes therefrom as fall within the scope of my claims.

In the drawing:

Figure l is a front elevational view of my auxiliary sound reproducing apparatus, with a loud speaker therein.

Figure 2 is a vertical side sectional view of my sound reproducing apparatus with a loud speaker mounted therein. I

Figure 3 is an enlarged detail view of two of the strips used to form my apparatus, united together. 7

As illustrated, for convenience in supporting my apparatus I provide a base 8 on which is mounted a saucer or bowl-shaped member 9, which is the preferred form of my apparatus. Said member 9 has an opening Ill at the front F thereof, adjacent to which opening and rearwardly thereof is a loud speaker H which is within said member 9, there being a piece of felt or hair lining l2 inserted between the outer rim of said loud speaker H and the inner surface of said saucer-like member 9, to which member said loud speaker may be fastened or held in any conventional way. This presents the front-portion or mouth of said loud speaker, through which the sound escapes, at the commencement of said opening H) inside said saucer-shaped member 9. It is undesirable to have said loud speaker project into said opening itself, that is, opposite the solid portions S which forms said saucer-shaped member 9.

Results in improved tone and greater volume can be attained with said saucer-shaped member 9 as above described, which leaves it open at the 6 back; but I find it preferable to enclose said member with a back I4, placing hair lining, felt or the like 13 around the rim or peripheral edge of said saucer-shaped member, which is at the rear, and covering the rear of said member 9 with a 10 solid back M which is preferably made fiat, and which is held to said member 9 by screws l5. This back [4 encloses said saucer-shaped member 9 and provides an enclosed acoustical chamber within said member 9. If desirable, said back I4 15 can be continued below said member 9 to form a base 8 integral therewith, as shown, although this is a matter of choice in manufacture. Best results are obtained with a peripheral rim which is circular, although suitable variations in its 20 shape can be made if convenience calls for them.

Said saucer-shaped member 9 is formed of strips of wood l8 which taper in width from the peripheral rim of said member towards the front F, as illustrated. These strips I8 are united to- 25 gether by some commonly known adhesive material l9. preferably having elastic qualities which will permit some expansion and contraction, and, of course, said strips l8 may be otherwise held together by any well known mechanical means if desired. While said strips are preferably made of a relatively thick piece of wood which is too thick to be bent to the desired shape, and, therefore, is sawed or otherwise cut out of a board to the final curvature desired, they can be made of thinner wood or a multiplicity of laminations.

For the ordinary electrical loud speaker having a maximum diameter of twelve inches I have found that using it with a saucer-shaped member four feet in maximum diameter and having a maximum depth of one foot, produces very good results, although the said dimensions and pro portional dimensions of said loud speaker and member may be varied; but it is desirable to have said member substantially greater in maximum diameter than the mouth of said speaker. Satisfactory results are obtained by the use of wood V of an inch thick to make said member 9; but the thickness can be varied, of course. Other well known materials having good acoustical properties may be substituted for wood.

What I claim is:

1. A sound amplifying apparatus in combination with a loud speaker, said apparatus embodying a saucer or bowl-shaped member, and a solid back secured to the peripheral rim thereof, said saucer-shaped member and back together constituting a completely enclosed chamber, said saucer-shaped member having an opening at the central portion thereof, said loud speaker being positioned wholly in the chamber of said apparatus, registering with and completely covering said opening, said saucer-shaped member composed of a multiplicity of pieces of material extending from the periphery of said member to the central opening thereof and adhesively secured together.

2. A sound amplifying apparatus in combination with a loud speaker, said apparatus embodying a saucer or bowl-shaped member, and a solid back secured to the peripheral rim thereof, said saucer-shaped member and back together constituting a completely enclosed chamber, said saucer-shaped member having an opening at the central portion thereof, said loud speaker being positioned wholly in the chamber of said apparatus, registering with and completely covering said opening, the outward curvature of said saucershaped member towards its periphery extending in a direction opposite to that of the normal passage of sound waves through said loud speaker outwardly.

HARRY A. ADAMS. 

